CN117864900A - Double-insurance elevator safety system - Google Patents

Abstract

The invention relates to the technical field of elevator braking, in particular to a double-insurance elevator safety system, which comprises an elevator host encoder and a braking and braking connecting rod mechanism, wherein the braking and braking connecting rod mechanism comprises two sliding blocks arranged on two safety tongs and a braking connecting rod arranged between the two sliding blocks; the elevator host encoder is used for acquiring the rotating speed of the elevator host; the brake device also comprises an electromagnet, wherein the electromagnet comprises a telescopic sliding rod, and the free end of the sliding rod is connected with a brake link mechanism; in the initial state, the sliding rod stretches out, and the electromagnet is used for controlling the sliding rod to shrink according to the condition that the rotating speed of the elevator host exceeds a preset speed threshold value. By adopting the scheme, various braking insurance can be provided for the operation of the elevator, and the overspeed descending of the elevator car is prevented.

Description

Double-insurance elevator safety system

Technical Field

The invention relates to the technical field of elevator braking, in particular to a double-insurance elevator safety system.

Background

Elevators are indispensable equipment in the current society, and during use of an elevator, a brake is one of the most frequently operated devices. The elevator brake comprises an emergency brake, the emergency brake mainly comprises a speed limiter and a safety clamp, the speed limiter is connected with a steel rope, and the steel rope and the elevator synchronously run. The safety tongs are arranged at the bottom of the elevator car, and the safety tongs comprise a sliding block which is connected with a steel rope. When the running speed of the elevator car is too high, the speed limiter brakes, the steel rope stops moving, the safety tongs move downwards along with the elevator car at the moment, the sliding blocks move upwards relative to the safety tongs, and the sliding blocks are propped against the elevator guide rail, so that a very large friction force exists between the safety tongs and the elevator guide rail, and the movement of the safety tongs is prevented, so that the elevator car is prevented from falling. In order to ensure the braking stability of the elevator, two safety clamps are usually arranged and are respectively positioned at two sides of the bottom of the elevator car, and the sliding blocks of the two safety clamps synchronously move through a braking connecting rod structure.

However, in the long-term use process, the speed limiter may fail, and once the speed limiter fails, the speed limiter cannot lock the elevator car when emergency braking is needed, so that the elevator car descends at an extremely high speed, and passengers in the elevator can be injured by the elevator after the elevator descends rapidly, and even life safety is endangered. There is a need for an elevator safety system that provides multiple braking safeties for elevator operation, preventing overspeed down of the elevator car.

Disclosure of Invention

The invention aims to provide a double-insurance elevator safety system which can provide various braking insurance for the running of an elevator and prevent an elevator car from descending at overspeed.

The invention provides the following basic scheme:

the double-insurance elevator safety system comprises an elevator host encoder and a braking and braking connecting rod mechanism, wherein the braking and braking connecting rod mechanism comprises sliding blocks arranged on two safety tongs and a braking connecting rod arranged between the two sliding blocks; the elevator host encoder is used for acquiring the rotating speed of the elevator host;

the brake device also comprises an electromagnet, wherein the electromagnet comprises a telescopic sliding rod, and the free end of the sliding rod is connected with a brake link mechanism; in the initial state, the sliding rod stretches out, and the electromagnet is used for controlling the sliding rod to shrink according to the condition that the rotating speed of the elevator host exceeds a preset speed threshold value.

The basic scheme has the beneficial effects that:

the elevator host encoder is host equipment of the existing elevator and is mainly used for monitoring the running speed of the elevator in real time, so that the acquired elevator host rotating speed is the real-time running speed of the elevator. The safety tongs are the existing emergency brake of the elevator, contact with the elevator guide rail through the upward movement of the control sliding block, and brake the elevator through the friction force between the sliding block and the elevator guide rail, so that the elevator can be braked at any position.

In this scheme, the slide bar of electro-magnet is connected with braking link mechanism, and the electro-magnet can control the flexible of slide bar to change the relative position of braking link mechanism and elevator car. In the initial state, the sliding rod extends out, and at the moment, the braking and braking link mechanism keeps a certain distance from the elevator car, and the sliding block and the elevator guide rail are not mutually interfered. When the speed limiter fails, the speed limiter cannot trigger the sliding block of the safety tongs to move upwards, and the elevator host encoder monitors that the running speed of the elevator car is too high, the electromagnet controls the sliding rod to shrink, and at the moment, the sliding rod drives the braking connecting rod mechanism to move upwards, namely the sliding block moves upwards or the braking connecting rod drives the sliding block to move upwards, and the sliding block is contacted with the elevator guide rail, so that the elevator car is braked at any position.

According to the scheme, the electromagnet is additionally arranged to provide various braking insurance for the elevator, the braking of the elevator car is realized at any position, the overspeed descending of the elevator car is prevented, and the operation safety of the elevator is improved.

Further, the free end of the sliding rod is connected with the sliding block, and the electromagnet is used for controlling the sliding rod to shrink according to the condition that the rotating speed of the elevator main machine exceeds a preset speed threshold value so as to enable the sliding block to move upwards.

The beneficial effects are that: with this design, the electro-magnet is at overspeed governor inefficacy, and when elevator car running speed is too fast, directly moves up through slide bar control slider, improves the response speed that the slider moved up to realize the quick braking of elevator car.

Further, the free end of the sliding rod is connected with the brake connecting rod, and the electromagnet is used for controlling the sliding rod to shrink according to the condition that the rotating speed of the elevator main machine exceeds a preset speed threshold value so as to enable the brake connecting rod to move upwards.

The beneficial effects are that: with this design, the electro-magnet is at the overspeed governor inefficacy, and when elevator car running speed is too fast, moves up through slide bar control braking connecting rod to drive the slider and move up. Two sliding upward movements can be controlled through one electromagnet, so that the braking stability of the elevator car is ensured, and meanwhile, the required devices are reduced, so that the occurrence of elevator faults is reduced.

Further, be equipped with the trigger piece on the slider, be equipped with the locking piece on the safety tongs, be equipped with first elastic component between locking piece and the safety tongs, the one end that the locking piece kept away from first elastic component is located the motion path of trigger piece, the one end contact that the first elastic component was kept away from with the locking piece to the trigger piece, and through the locking piece.

The beneficial effects are that: in the process of moving up the sliding block, the trigger block is contacted with the locking block, and an acting force is applied to the locking block, so that the locking block moves towards the first elastic piece, and the trigger block passes through the locking block. The trigger block passing through the locking block is blocked by the locking block, so that the trigger block cannot fall, namely cannot fall after sliding, and the sliding block keeps a state of being in contact with the elevator guide rail, so that the elevator car keeps a braking state.

Further, be equipped with first inclined plane on the trigger block, first inclined plane is from last to down by the trigger block to the locking piece slope, is equipped with the second inclined plane on the locking piece, and the second inclined plane is from last to down by the locking piece to the slope of trigger block, and first inclined plane can be when the trigger block passes through the locking piece, offsets with the second inclined plane.

The beneficial effects are that: the first inclined plane and the second inclined plane are arranged, so that the trigger block can smoothly slide through the locking block, and meanwhile, after the trigger block passes through the locking block, the trigger block cannot move reversely, so that the position of the trigger block is locked, and the braking state of an elevator car is ensured.

Further, the elevator car elevator control device further comprises a limiting block arranged on the elevator guide rail, and the triggering block can be propped against the limiting block when the elevator car falls to a specified position.

The beneficial effects are that: the stopper sets up in the pit of elevator shaft, is located specifically below the elevator bottom, sets up like this, and elevator car does not have limited position piece interference at the operation in-process, but when elevator car abnormal falling, elevator car will fall to stopper place, and the stopper stops the trigger piece this moment, and the trigger piece sets up on the safety tongs, and the safety tongs sets up in the bottom of elevator car. When the trigger block is blocked, the elevator car stops falling accordingly, thereby causing the elevator car to brake in a designated position. When the elevator speed limiter fails, the falling of the elevator car is buffered through the collision of the trigger block and the limiting block. The acting force of elevator car falling is reduced through buffering, acting force applied to other existing buffering equipment in an elevator shaft is reduced, and the elevator car is prevented from directly bottoming. Meanwhile, the collision between the trigger block and the limiting block can even prevent the elevator car from falling, so that the elevator car is braked.

Further, the trigger block includes bottom plate and trigger blend stop, and the bottom plate is connected with the slider, and trigger blend stop is located on the first inclined plane.

The beneficial effects are that: the setting of bottom plate, the increase triggers the stability that the blend stop is connected with the slider, when trigger piece offsets with the stopper, triggers the blend stop and can the furthest transmit the bottom plate with the effort that receives to pass through the bottom plate and transmit for elevator car, with this braking to the elevator car that realizes.

Further, set up vertical recess on the bottom plate, trigger blend stop and vertical recess sliding connection, trigger and be equipped with the second elastic component that can vertical compression between blend stop and the vertical recess, trigger the one end that the blend stop kept away from vertical recess and be equipped with vertical warning piece, the warning piece is kept away from the one end that triggers the blend stop and can stretch into in the elevator car.

The beneficial effects are that: when the triggering baffle bar is blocked by the limiting block, the triggering baffle bar moves upwards in the vertical groove to drive the warning piece to move upwards, so that the warning piece stretches into the elevator car. The setting of second elastic component for trigger blend stop and the bottom of vertical recess offset, warning piece does not expose this moment, avoids warning piece to interfere the passenger business turn over of elevator, also avoids the damage that the warning piece leads to because of elevator work simultaneously. The warning part is marked with a warning sign, when the elevator car brakes through the trigger block and the limiting block, passengers in the elevator are prompted through the warning part, passengers in the elevator are calmed, and user experience is improved.

Further, the both ends of second elastic component are connected with the top of vertical recess, trigger the top of blend stop respectively, and the second elastic component is the spring.

The beneficial effects are that: in the normal operation process of the elevator, the triggering barrier strip is positioned at the bottom of the vertical groove, the warning part is not exposed at the moment, interference to the in-and-out of passengers in the elevator is avoided, and meanwhile damage to the warning part is reduced. When the elevator car brakes, the triggering barrier strip limiting block blocks, the elastic force of the elastic piece is smaller than the acting force acted by the triggering barrier strip, the triggering barrier strip moves upwards, the warning piece is driven to move upwards, the warning piece stretches into the elevator car, passengers in the elevator are calmed, and user experience is improved.

Drawings

Fig. 1 is a schematic diagram of a double insurance elevator safety system according to an embodiment of the invention;

fig. 2 is an enlarged schematic view of a double insurance elevator safety system of the present invention at a of fig. 1;

fig. 3 is a schematic diagram of a second embodiment of a double insurance elevator safety system according to the present invention;

fig. 4 is an enlarged schematic view of a double insurance elevator safety system of the present invention at B of fig. 3;

fig. 5 is a schematic diagram of a third embodiment of a double insurance elevator safety system of the present invention;

fig. 6 is an enlarged schematic view of a double insurance elevator safety system of the present invention at C of fig. 5.

Detailed Description

The following is a further detailed description of the embodiments:

reference numerals in the drawings of the specification include: safety tongs 1, brake link 2, elevator car 3, electro-magnet 4, bottom plate 5, trigger blend stop 6, locking piece 7, first inclined plane 8, second inclined plane 9, stopper 10, elevator guide rail 11, slider 12, first link 13, warning sign 14.

Example 1

A double-insurance elevator safety system, as shown in fig. 1 and 2, comprises an elevator host encoder and a braking connecting rod 2 mechanism, wherein the braking connecting rod 2 mechanism comprises two sliding blocks 12 arranged on two safety tongs 1, and a braking connecting rod 2 arranged between the two sliding blocks 12. The safety tongs 1 and the braking connecting rod 2 are emergency brakes of the existing elevator, the two safety tongs 1 are respectively arranged on two sides of the bottom of the elevator car 3, the safety tongs 1 comprise sliding blocks 12 used for braking, and two ends of the braking connecting rod 2 are respectively connected with the two sliding blocks 12. During braking, the brake connecting rod 2 moves upwards relative to the elevator car 3, the sliding block 12 is driven to move upwards relative to the safety tongs 1, so that sliding is against the elevator guide rail 11, and the elevator car 3 is braked by friction between the sliding and the elevator guide rail 11.

The elevator host encoder is used for acquiring the rotation speed of the elevator host, and in the elevator running process, the elevator host encoder monitors the rotation speed of the elevator host in real time, and the rotation speed of the elevator host reflects the running speed of the elevator car 3.

The device also comprises an electromagnet 4, wherein the electromagnet 4 comprises a telescopic sliding rod. Specifically, the electromagnet 4 includes an electromagnetic body, and a slide rod that can be extended from the electromagnetic body. The electromagnet 4 controls the existence of magnetic force by on-off of internal current, thereby controlling the action of the telescopic rod.

The free end of the sliding rod is connected with the brake link 2 mechanism, and in an initial state, the sliding rod extends out, so that the brake link 2 mechanism is kept at a certain distance from the elevator car 3. The electromagnet 4 is used for controlling the sliding rod to retract according to the condition that the rotating speed of the elevator main machine exceeds a preset speed threshold value. The speed threshold is an upper limit of the running speed of the elevator preset in advance, for example, the speed threshold is 2.0 meters per second, and when the rotation speed of the elevator host monitored by the elevator host encoder exceeds 2.0 meters per second, the electromagnet 4 controls the sliding rod to shrink, so that the sliding block 12 moves upwards to brake the elevator car 3.

In this embodiment the free end of the slide bar is connected to the slide 12, at which time an electromagnet 4 is mounted on the safety gear 1, the electromagnet 4 being arranged to control the slide bar to retract in order to move the slide 12 upwards in response to the elevator machine rotating speed exceeding a preset speed threshold. In other embodiments, the free end of the sliding rod is connected with the brake link 2, at this time, the electromagnet 4 is mounted on the elevator car 3, and the electromagnet 4 is used to control the sliding rod to retract according to the condition that when the rotation speed of the elevator main machine exceeds the preset speed threshold value, so that the brake link 2 moves upwards, and the brake link 2 drives the slide block 12 to move upwards.

In this scheme, the slide bar of electro-magnet 4 is connected with braking connecting rod 2 mechanism, and electro-magnet 4 can control the flexible of slide bar to change the relative position of braking connecting rod 2 mechanism and elevator car 3. In the initial state, the sliding rod extends out, and at the moment, the braking and braking connecting rod 2 mechanism keeps a certain distance from the elevator car 3, and the sliding block 12 and the elevator guide rail 11 are not mutually interfered. When the speed limiter fails, the speed limiter cannot trigger the sliding block 12 of the safety tongs 1 to move upwards, and the elevator host encoder monitors that the running speed of the elevator car 3 is too high, the electromagnet 4 controls the sliding rod to shrink, and at the moment, the sliding rod drives the braking connecting rod 2 to move upwards, namely the sliding block 12 moves upwards or the braking connecting rod 2 drives the sliding block 12 to move upwards, and the sliding block 12 is contacted with the elevator guide rail 11, so that the elevator car 3 is braked at any position. This scheme is through addding electro-magnet 4, for the braking insurance of multiple braking of elevator, realizes the braking of elevator car 3 in the optional position, prevents that elevator car 3 from overspeed down, improves the security of elevator operation.

Example two

The present embodiment is different from the first embodiment in that:

in a double-insurance elevator safety system, as shown in fig. 3 and 4, a triggering block is arranged on a sliding block 12, the triggering block comprises a bottom plate 5 and a triggering baffle strip 6, and the bottom plate 5 is connected with the sliding block 12. Specifically, the triggering barrier 6 is disposed on a side surface of the bottom plate 5 away from the slider 12, and the length direction of the triggering barrier 6 is perpendicular to the side surface. The bottom plate 5 and the triggering baffle 6 are integrally formed. In this embodiment, the base plate 5 is detachably connected to the slider 12 by screws. The bottom plate 5 has the same longitudinal sectional shape as the slider 12. In other embodiments, the longitudinal section of the bottom plate 5 is smaller than the longitudinal section of the slider 12, and the bottom plate 5 does not interfere with the movement of the slider 12 during the movement of the slider 12.

The safety tongs 1 are provided with locking blocks 7, and a first elastic piece is arranged between the locking blocks 7 and the safety tongs 1. Specifically, the locking block 7 comprises a telescopic sleeve and a telescopic body, one end of the telescopic body is positioned in the telescopic sleeve, a first elastic piece is arranged between the telescopic body and the telescopic sleeve, and the other end of the telescopic body faces the triggering block and can be in contact with the triggering block. The telescopic sleeve is fixedly connected with the safety gear 1, in this embodiment the first elastic member is a spring.

The trigger block is provided with a first inclined plane 8, and the first inclined plane 8 is inclined from the trigger block to the locking block 7 from top to bottom. Specifically, the first inclined surface 8 is provided on the side of the trigger bar 6 facing the lock block 7. The locking block 7 is provided with a second inclined plane 9, the second inclined plane 9 is inclined from the locking block 7 to the triggering block from top to bottom, and the second inclined plane 9 is arranged at one end of the telescopic body, which faces the triggering block.

The end of the locking block 7 away from the first elastic member is located on the movement path of the trigger block, and the trigger block can be contacted with the end of the locking block 7 away from the first elastic member and pass through the locking block 7. The first inclined surface 8 can abut against the second inclined surface 9 when the trigger block passes the locking block 7. The first inclined plane 8 and the second inclined plane 9 enable the trigger block to smoothly slide through the locking block 7, and meanwhile the trigger block cannot move reversely after passing through the locking block 7, so that the position of the trigger block is locked, and the braking state of the elevator car 3 is guaranteed.

And further comprises a limiting block 10 arranged on the elevator guide rail 11. Specifically, the stopper 10 is disposed on a side of the elevator guide rail 11 away from the elevator car 3, the stopper 10 is detachably connected with the elevator guide rail 11, and in this embodiment, the stopper 10 is detachably connected with the elevator guide rail 11 by a screw.

The existing elevator is provided with an elevator guide rail 11 at two sides of an elevator car 3 respectively, and two safety tongs 1 are matched with the two elevator guide rails 11 respectively to realize the braking of the elevator car 3. The number of the limiting blocks 10 is multiple, and the limiting blocks 10 are respectively arranged on the elevator guide rail 11. In this embodiment, the number of the limiting blocks 10 is two, the two limiting blocks 10 are respectively located on the two elevator guide rails 11, the number of the corresponding triggering blocks is two, the two triggering blocks are respectively located on the two safety tongs 1, and the triggering blocks are in one-to-one correspondence with the limiting blocks 10. Trigger blocks and limiting blocks 10 which are matched with each other are arranged on two sides of the elevator car 3, so that the braking stability of the elevator car is improved.

The limiting block 10 is arranged on a motion track of the trigger block along with the movement of the elevator car 3, and the trigger block can be propped against the limiting block 10 when the elevator car 3 falls to a specified position. Specifically, the stopper 10 is disposed on a movement track of the trigger bar 6 along with the movement of the elevator car 3, and the trigger bar 6 can be abutted against the stopper 10 when the elevator car 3 falls to a specified position.

In practical application, the limiting block 10 is arranged at a designated position which does not affect normal operation of the elevator, for example, the floor of the elevator is the lowest floor, and then the elevator shaft is provided with a space (namely a pit) below the first floor, so that relevant equipment of the elevator and the like can be maintained conveniently, and the limiting block 10 is arranged on the elevator guide rail 11 below the lowest floor. When the elevator breaks down and the elevator speed limiter fails, the elevator car 3 falls down, when the elevator speed limiter falls to a specified position, the trigger stop bar 6 collides with the limiting block 10, the limiting block 10 buffers the elevator car 3, meanwhile, the trigger stop bar 6 moves upwards, the driving slide block 12 moves upwards, the slide block 12 of the safety tongs 1 moves upwards, the safety tongs 1 offsets with the elevator guide rail 11, the elevator car 3 is braked by friction force between the safety tongs 1 and the elevator guide rail 11, and the elevator car 3 is locked at the specified position, so that the elevator car 3 is prevented from touching the bottom, and larger damage to passengers in the elevator is avoided.

Example III

The present embodiment is different from the above embodiment in that:

as shown in fig. 5 and 6, a vertical groove is formed in the bottom plate 5, the triggering barrier strip 6 is slidably connected with the vertical groove, and a second elastic piece capable of being compressed vertically is arranged between the triggering barrier strip 6 and the vertical groove.

Specifically, the vertical recess is offered to one side that slider 12 was kept away from to bottom plate 5, is equipped with the second elastic component in the vertical recess, and the both ends of second elastic component are connected with the top of vertical recess, the top of triggering blend stop 6 respectively, and the second elastic component can be in vertical direction deformation. The notch of vertical recess is equipped with the retaining ring, triggers the one end circumference that blend stop 6 is located vertical recess and extends to form the blocking portion, and the retaining ring is used for stopping to trigger blend stop 6 to deviate from in the vertical recess, and the retaining ring offsets with blocking portion promptly. In this embodiment, the second elastic member is a spring.

The one end that keeps away from vertical recess of triggering blend stop 6 is equipped with vertical warning piece, and the one end that the warning piece kept away from triggering blend stop 6 can stretch into in the elevator car 3.

Specifically, the warning piece includes first connecting rod 13 and warning sign 14, and first connecting rod 13 vertical setting triggers the one end that the blend stop 6 kept away from bottom plate 5 and is connected with first connecting rod 13, and first connecting rod 13 keeps away from the one end that triggers blend stop 6 and is connected with warning sign 14, is equipped with the warning sign on the warning sign 14. The safety tongs 1 is located elevator car 3 bottom, and bar hole has been seted up to elevator car 3's bottom, and the pore wall in bar hole communicates with elevator car 3's lateral wall, and the last apron that articulates of elevator car 3, apron are used for the lid to close bar hole. The warning sign 14 can extend into the elevator car 3, and when the warning sign 14 moves up, the warning sign 14 pushes the cover plate away, and moves up from the strip-shaped hole, so that the warning sign is exposed in the elevator car 3.

The elevator can be overhauled regularly, and the elevator overspeed governor loses efficacy, and usually when the elevator motion fails, the elevator overspeed governor breaks down in the braking process, so that the elevator overspeed governor fails, namely when the elevator brakes, the elevator overspeed governor brakes the elevator, and after a certain time after the moment, the elevator overspeed governor cannot brake, and the elevator falls down to brake through the collision of the trigger block and the limiting block 10. The setting of warning piece, when elevator overspeed governor braking, elevator overspeed governor makes slider 12 shift up, drives the whole upward movement of trigger piece, and warning piece shifts up this moment, stretches into elevator car 3 in, prompts the passenger in the elevator through the warning piece to this reduces passenger's panic degree, avoids producing other dangerous conditions because of passenger panic causes the elevator.

Example IV

The present embodiment is different from the above embodiment in that:

in the double-insurance elevator safety system, the double-insurance elevator safety system further comprises an independent standby power supply circuit, wherein the electromagnet 4 is connected to the standby power supply circuit, so that the electromagnet 4 can control the existence of magnetic force through the on-off of internal current, and further control the action of the telescopic rod. The intelligent warning device further comprises a projection lamp, wherein the projection lamp is connected to the standby power supply circuit, and when the projection lamp is used for starting the electromagnet 4, warning words are projected. The projection lamp sets up on warning sign 14, and inside towards elevator car 3 for throw the warning sign inside elevator car 3, for the passenger looks over.

When the electromagnet 4 is energized, the projection lamp is started to start projection. When the elevator breaks down, the light in the elevator can not be used, at the moment, the light in the elevator is weak, the environment is dim, and passengers in the elevator can not see the first warning language. In this scheme, through the setting of projection lamp, firstly inform passenger's elevator's specific braking condition step by step, further alleviate passenger's panic, promote user experience sense, secondly provide the supplemental light source for the passenger in the elevator, alleviate the passenger panic because of light leads to, further promote user experience sense.

The foregoing is merely an embodiment of the present invention, and a specific structure and characteristics of common knowledge in the art, which are well known in the scheme, are not described herein, so that a person of ordinary skill in the art knows all the prior art in the application day or before the priority date of the present invention, and can know all the prior art in the field, and have the capability of applying the conventional experimental means before the date, so that a person of ordinary skill in the art can complete and implement the present embodiment in combination with his own capability in the light of the present application, and some typical known structures or known methods should not be an obstacle for a person of ordinary skill in the art to implement the present application. It should be noted that modifications and improvements can be made by those skilled in the art without departing from the structure of the present invention, and these should also be considered as the scope of the present invention, which does not affect the effect of the implementation of the present invention and the utility of the patent. The protection scope of the present application shall be subject to the content of the claims, and the description of the specific embodiments and the like in the specification can be used for explaining the content of the claims.

Claims (9)

1. The double-insurance elevator safety system comprises an elevator host encoder and a braking and braking connecting rod mechanism, wherein the braking and braking connecting rod mechanism comprises sliding blocks arranged on two safety tongs and a braking connecting rod arranged between the two sliding blocks; the elevator host encoder is used for acquiring the rotating speed of the elevator host; the method is characterized in that:

the brake device also comprises an electromagnet, wherein the electromagnet comprises a telescopic sliding rod, and the free end of the sliding rod is connected with a brake link mechanism; in the initial state, the sliding rod stretches out, and the electromagnet is used for controlling the sliding rod to shrink according to the condition that the rotating speed of the elevator host exceeds a preset speed threshold value.

2. A double insurance elevator safety system according to claim 1, characterized in that: the free end of the sliding rod is connected with the sliding block, and the electromagnet is used for controlling the sliding rod to shrink according to the condition that the rotating speed of the elevator host exceeds a preset speed threshold value so as to enable the sliding block to move upwards.

3. A double insurance elevator safety system according to claim 2, characterized in that: the free end of the sliding rod is connected with the brake connecting rod, and the electromagnet is used for controlling the sliding rod to shrink according to the condition that the rotating speed of the elevator main machine exceeds a preset speed threshold value so as to enable the brake connecting rod to move upwards.

4. A double insurance elevator safety system according to any of claims 1-3, characterized in that: the sliding block is provided with a trigger block, the safety tongs are provided with a locking block, a first elastic piece is arranged between the locking block and the safety tongs, one end of the locking block, which is far away from the first elastic piece, is located on the moving path of the trigger block, and the trigger block can be contacted with one end of the locking block, which is far away from the first elastic piece, and passes through the locking block.

5. The double insurance elevator safety system according to claim 4, wherein: the trigger block is provided with a first inclined plane, the first inclined plane is inclined from the trigger block to the locking block from top to bottom, the locking block is provided with a second inclined plane, the second inclined plane is inclined from the locking block to the trigger block from top to bottom, and the first inclined plane can be propped against the second inclined plane when the trigger block passes through the locking block.

6. The double insurance elevator safety system according to claim 5, wherein: the elevator car trigger device is characterized by further comprising a limiting block arranged on the elevator guide rail, and the trigger block can be propped against the limiting block when the elevator car falls to a designated position.

7. The double insurance elevator safety system according to claim 6, wherein: the trigger block comprises a bottom plate and a trigger stop bar, the bottom plate is connected with the sliding block, and the first inclined plane is arranged on the trigger stop bar.

8. The double insurance elevator safety system according to claim 7, wherein: the vertical groove is formed in the bottom plate, the triggering barrier strip is in sliding connection with the vertical groove, a second elastic piece which can be compressed vertically is arranged between the triggering barrier strip and the vertical groove, a vertical warning piece is arranged at one end, far away from the vertical groove, of the triggering barrier strip, and one end, far away from the triggering barrier strip, of the warning piece can stretch into an elevator car.

9. The double insurance elevator safety system according to claim 8, wherein: the two ends of the second elastic piece are respectively connected with the top of the vertical groove and the top of the triggering baffle bar, and the second elastic piece is a spring.